scholarly journals GENETIC FEATURES AND RESOURCES OF RARE METAL DEPOSITS OF THE UKRAINIAN SHIELD

2017 ◽  
Vol 1 (76) ◽  
pp. 58-65
Author(s):  
V. Zagnitko ◽  
◽  
V. Mykhailov ◽  
S. Kryvdic ◽  
V. Sydorchuk ◽  
...  
Keyword(s):  
Rare Metal ◽  
Ukrainian Shield ◽  
Genetic Features

scholarly journals GRANITOIDS, RARE-METAL PEGMATITES AND Ta-Nb MINERALIZATION OF SHPOLIANO-TASHLYK ORE AREA (INGUL MEGABLOCK, UKRAINIAN SHIELD)

2018 ◽  
pp. 24-29
Author(s):  
O. Hrinchenko ◽  
S. Bondarenko ◽  
T. Mironchuk
Keyword(s):  
Rare Metal ◽  
Ukrainian Shield ◽  
Wide Range ◽  
Ore Minerals ◽  
Ore Mineralization ◽  
Isomorphic Series ◽  
Single Complex ◽  
Complex Features ◽  
First Time ◽  
Range Of Values

Composition of granites, genetically associated pegmatites and superimposed metasomatites distributed within Shpoliano-Tashlyk ore area (Ingul megablock) is considered. It is established, that on the basis of similarity in their petrographic and petrochemical features granitoids of the area can be related to single complex. Features of ore mineralization are defined by both composition of granitoids (Sgranites) after which rare-metal pegmatites are formed and intensity of superimposed metasomatic alterations. Main minerals-concentrators of Ta and Nb mineralization in granitic pegmatites and metasomatites are represented by minerals of three isomorphic series – columbite-tantalite (Fe,Mn)(Nb,Ta,Ti)2O6, ilmenorutile-struverite (Ti,Nb,Ta)O2 and pyrochlore-microlite (Ca,Na)2Ta2O6(O,B,OH,F). Depending on geological setting such ore minerals as tapiolite, ixiolite, cassiterite, uraninite, nigerite, gahnite are commonly found in association with these minerals. Chemical composion of tantalo-niobates sampled from ore-bearing pegmatites and metasomatites is investigated by microprobe analysis. Most minerals of columbite-tantalite series are characterized by distinct and rhythmic internal zonality and contrasting mosaic structure which are related to considerable heterogeneities of their chemical composition. Within one aggregate mineral phases with wide range of values – from 9,80 to 71,0 % for Ta2O5 and from 10,6 to 70,1 % for Nb2O5 – are established. Among minerals ferruginous varieties which composition relates to Fe-columbite-tantalites (Nb2O5/Ta2O5 = 1–1,2; FeO/MnO = 2,5–6) prevail. Columbite-tantalites are characterised by high contents of admixture elements present (%): TiO2 – to 5,88; WO3 – to 3,70; SnO2 – to 9,20; Sc2O3 – to 5,40. Scandium ores occur as scandium-rich minerals that are mostly confined to the minerals of columbite-tantalite series found in Polohivka ore field. On the Ukrainian Shield high contents of Sc2O3 in tantalo-niobates are established for the first time. Minerals of ilmenorutile-struverite series do not quantitatively yield to minerals of columbite-tantalite series. For minerals of this series Nb2O5/Ta2O5 ratio varies in the range of 0,6-1,4. Among characteristic admixture-elements are prevailed (%): SnO2 – to 3,1, V2O5 – to 5,05; FeO – to 11,51, Cr2O3 – to 1,20. Minerals of pyrochlore-microlite series are of subordinate importance. For the first time by results of U-Pb dating of columbite-tantalites from Mostove ore manifestation (Shpoliano-Tashlyk area) the age of Ta-Nb mineralization is established to be about 1965 ± 25 million years.

scholarly journals FEATURES OF BERILLIUM AND RARE METAL MINERALIZATION IN SYENITE OF THE PERGA DEPOSIT (UKRAINIAN SHIELD)

2020 ◽  
pp. 92-97
Author(s):  
О. Dubyna ◽  
S. Kryvdik ◽  
V. Belskyy ◽  
О. Vyshnevskyi
Keyword(s):  
Rare Earth ◽  
Fluid Phase ◽  
Rare Metal ◽  
Geochemical Characteristics ◽  
Ukrainian Shield ◽  
Alkaline Solutions ◽  
Published Data ◽  
Rare Metals ◽  
Rare Metal Mineralization ◽  
Mn Content

The results of the ore and accessory minerals study in the syenite of the Perga beryllium deposit are discussed. Phenakite and genthelvite are found among Be-bearing minerals. Genthelvite of this syenite, being compared to early published data on genthelvite of the Perga deposit, is distinguished by the highest ZnO content which is close to the theoretical maximum) due to the alkaline nature of studied rock ((Na + K)/Al = 1.09). Genthelvite occurs as later mineral to phenakite or is formed by phenakite replacement at rising the alkalinity as a result of melt differentiation. Columbite with high-Mn content, Y-silicate (keiviite-(Y)?), rare-earth fluorocarbonate (bastnesite) are also found among other minerals of rare metals. The presence of fluorite and rare-earth fluorocarbonate in association with genthelvite or phenakite may indicate that Be and REE were transported in ore-bearing fluids as complex fluorine-carbonate compounds. Considering the geochemical characteristics of rocks (meta-aluminous, subalkaline and alkaline series, deep negative Euanomalies, low Sr, Ba, elevated – HFS elements) from the Sushcano-Perga region, enrichment of these rocks with rare metals and Be are related to intensive feldspar fractionation of the primary melts and due to alkaline oversaturation, volatile and rare metals (Be, Li, REE, Y, Nb, Ta) enrichment in the residual fractions of granitic or syenitic compositions. Postmagmatic alkaline solutions enriched in F and CO32- promote of Be concentration in fluid phase with its following migration and crystallization as genthelvite.

scholarly journals GEOCHRONOLOGY OF LITHIUM-BEARING GRANITOIDS OF INGUL MEGABLOCK (UKRAINIAN SHIELD)

2018 ◽  
pp. 23-28 ◽  
Author(s):  
L. Stepanyuk ◽  
O. Hrinchenko ◽  
B. Slobodian ◽  
V. Semka ◽  
S. Kurylo ◽  
...  
Keyword(s):  
Economic Development ◽  
Rare Metal ◽  
Ukrainian Shield ◽  
Rare Metals ◽  
Isotopic Method ◽  
Metallic Mineral ◽  
Level Of Economic Development ◽  
Modern Level ◽  
Marine Basins ◽  
Rare Metal Pegmatite

Rare-metal elements are strategic metals which, in general, are extremely important for economic development or maintenance of defence capability of any country at the modern level. The list of needs for these strategic metals ranges depending on the level of economic development of certain country, but in general it includes such elements as Li, Ta, Nb, Be, Sb, W, REE and others. The majority of these elements has the lithophilous nature and, therefore, is characterized by close genetic relations with granites and pegmatites associated with them. In the world, industrial production of lithium is shared between deposits to lithium-bearing brine of saline depositions of marine basins (Argentina, Chile), some granites (China) and rare-metal pegmatites (Australia, China, Zimmbabve). In pegmatites lithium mineralization is represented mainly by spodumene (LiAlSi2O6), But other lithium-containing metallic minerals can also play an important role in production of this metal – petalite (LiAlSi4O10), minerals of lepidolite (Sa [Li,Al]3[Si,Al]4O10[F,OH]2) and amblygonite-montebrasite (LiAlPO4 [F,OH]) series. Rare-metal pegmatite of Ingul megablock of Ukrainian Shield can be treated as unique (insufficiently studied in world practice) pegmatitic formations in which the main metallic mineral is represented by petalite. In metallogenic interpretations two ore districts can be distinguished within the megablok, that are specialized on rare metals (Li, Rb, Cs, Be, Ta, Nb, Sn) – Polohivka and Stankuvatka. Deposits and numerous ore manifestations of rare metals formed in rather similar geological and tectonic conditions and have many common features – both country rocks composition and mineralogic composition of ores. Within Ingul megablock (Shpola-Tashlyk rare-metal district) a number of lithium rare-metal deposits associated with pegmatites is discovered. In order to determine the age of lithium mineralization in granites of Lypniazhka, Taburyshche massifs and vein bodies of pegmatitic and aplito-pegmatitic granites, which are selected from different localities of this megablock, are dated by U-Pd isotopic method by monazites. It is established that emplacement of vein granites of Ingul megablock occurred within rather narrow age interval – 2040-2020 Ma and it is not significantly separated in time from formation of most granitoids they are spatially associated with. This fact, together with geological evidences, gives grounds to make the assumption that rare-metal lithium pegmatite are formed in the same age interval.

scholarly journals ORE-BEARING METASOMATITES OF PERGA AREA AND KOROSTEN PLUTON GRANITOIDS (UKRAINIAN SHIELD): GENETIC RELATIONS ON THE BASIS OF GEOCHEMICAL MODELLING

2018 ◽  
pp. 66-79
Author(s):  
I. Lazareva ◽  
S. Shnyukov ◽  
A. Aleksieienko ◽  
L. Gavryliv
Keyword(s):  
Element Concentration ◽  
Weight Fraction ◽  
Rare Metal ◽  
Aqueous Fluid ◽  
Major And Trace Elements ◽  
Ukrainian Shield ◽  
Geochemical Data ◽  
Geochemical Model ◽  
Multistage Processes ◽  
Residual Melt

Geochemistry of the most typical ore-bearing (sulfide-rare metal mineralization) metasomatites formation within tectonic zones (Perga area) spatially associated with Precambrian (1.75-1.8 Ga) Korosten anorthosite-rapakivigranite pluton (Ukrainian Shield) was investigated in detail. Major and trace elements behavior during the multistage alteration of predominantly granites was studied. All investigated altered varieties were classified into several geochemical types of alteration which result in formation of corresponding metasomatites during the multistage processes: (1) Fe – Mg – Na – K – Zn, Pb, Nb, Rb, Cs, Cd (Be, Li, Ta etc.) – apogranites, albitites-I, albite-microcline, microclinealbite, siderophyllite-feldspar and siderophyllite metasomatites; (1a) Na – Nb, Sn (Ta, Be etc.) – albitites-II; (2) Si – (Sn, Be, W etc.) – apogranites and quartz-muscovite greisens. Metasomatites of the 1st (main) type are widely distributed and contain the most of related economic mineralization. Geochemical data obtained were compared to hypothetical compositions of metasomatites, calculated from predesigned geochemical model of the Korosten pluton granitoid evolution based on fractional crystallization equations. A set of zircon, apatite and monazite solubility equations in silicate melts was used in the model designed to estimate magma crystallization temperature in deep chamber and the level of its saturation in H2O. Dependences CL=C0fD-1 (C0 = element concentration in parent magma, CL = element concentration in residual melt, f = weight fraction of liquid phase in magma chamber, D = bulk distribution coefficient of the element) for Zn, Pb, Nb, F and Cl show inverse nature. Their extremum points indicate f value when residual melt reaches saturation in water (aqueous fluid separation beginning). This makes it possible to calculate the KF/L = CF/CL (CF – element concentration in fluid) values and to estimate the Zn, Pb, Nb concentrations in hypothetical (model) metasomatites. Model (calculated) element concentrations correspond to the composition of natural ore-bearing metasomatites of the Perga area. These results confirm the hypothesis that high-temperature metalbearing fluids, which formed metasomatites, were produced by the Korosten pluton granitoids during their magmatic evolution.

scholarly journals Rare metal granites and related rocks of the Ukrainian shield

1993 ◽  
Vol 65 (2) ◽  
pp. 121-131
Author(s):  
K.Y. Esipchuk ◽  
Y.M. Sheremet ◽  
K.I. Sveshnikov
Keyword(s):  
Rare Metal ◽  
Ukrainian Shield

scholarly journals Location pattern and genetic classification of granite pegmatites of the Ukrainian Shield

2019 ◽  
Vol 28 (4) ◽  
pp. 673-691
Author(s):  
Leonid V. Isakov ◽  
Maria L. Isakova
Keyword(s):  
Classification Scheme ◽  
Granite Gneiss ◽  
Mineralogical Composition ◽  
Rare Metal ◽  
Ukrainian Shield ◽  
Genetic Classification ◽  
Genetic Groups ◽  
Crystalline Core ◽  
Tectonic Zones

The pegmatites of the Ukrainian Shield, their formation and occurrence are con- sidered. It is shown that the Ukrainian Shield is a pegmatite province encompassing seven regions: Middle Prydniprovia, Western Pryazovia, Eastern Pryazovia, Ingulski, Rosynsko- Tikytski, Dnistersko-Buzki and Volyn, respectively encompassing megastructures of the same names and including pegmatite fields of different mineralogical composition and geochemical specialization. The Volynski, Ingulski, Middle Prydniprovia, Western Pryazovia regions have rare-earth and rare-metal specialization presented by pegmatites of different origin and petrological and mineral composition and occurring in different structural and tectonic conditions, having different formation age, which allows a full classification scheme of the pegmatites of Ukrainian Shield to be given. These structures can be considered as having formed as a result of abyssal magmatic plumes. The geological-structural position of these megastructures with obvious signs of influence of certain abyssal processes on their formation supports this assumption. We present the main geological structural and genetic factors of formation of pegmatite-bearing megastructures of the Ukrainian crystalline core-area, these factors forming the basis of a classification scheme of pegmatites of Pre-Cambrian shields. We have systematized the pegmatites of the Ukrai- nian Shield , and designed their classification scheme . We have distinguished the following groups of pegmatites by the development of pegmatite-generating zones: - three genetic groups of pegmatites: ultrametamorphogenic, magmatogenic and metamorphogenic-meta- somatic; - six genetic subgroups of pegmatites: migmatic; autochthonous granite massifs; metamorphogenic and metasomatic displaced and formed pegmatites; multiphase intrusive granite massifs; multiphase intrusive alkaline massifs; multiphase granite batholiths. By the nature of pegmatite-bearing structures, the following structural groups have been singled out: granite-gneiss regional structures and domes; dome- synclinore and dome-trough plume-structures (subgroups: interdome synclinore and trough structures, in particular greenstone structures; intrusive domes and batholiths); specific tectonic zones of stress tensions.

scholarly journals PEGMATITES AS A SOURCE OF RARE-METAL AND RARE-EARTH MINERALIZATION WITHIN THE CENTRAL AND WESTERN PARTS OF THE UKRAINIAN SHIELD

2018 ◽  
pp. 8-11
Author(s):  
A. P. Vasylenko ◽  
L. V. Isakov
Keyword(s):  
Rare Earth ◽  
Internal Structure ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Rare Metal ◽  
Ukrainian Shield ◽  
Structural Units ◽  
Fourth Group ◽  
The Third

Regularities in the distribution of rare-metal and rare-earth pegmatites within the Western and Central parts of the Ukrainian shield are determined. New geological criteria and search signs for rare-metal and rare-earth mineralization have been developed. The first group includes the forecasting criteria that are tied to the general patterns of location of pegmatites in time (geochronological) and space (megastructural). These criteria define the main structural units (pegmatites provinces, regions, districts) and their metallogenic specialization. The second group combines regional criteria among which are distinguished tectonostructural, magmatic and metamorphic. These forecasting criteria define the formation and localization of the pegmatite belts and fields. The third group consists of criteria that emerge from the conditions for the formation and localization of pegmatite nodes and bundles. The fourth group are the criteria of pegmatite bodies that can be identified during study their internal structure. These are mineralogical-geochemical, structural-textural, petrochemical, thermobarochemical and thermoluminescent. Prospects for further work aimed at identifying new rare-metal and rare-earth metal deposits within pegmatite-bearing fields are estimated.

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